Phosphates

it will depend on where the phosphates are coming from, how long it has been a problem, size of tank, amount of GFO you run, etc...

Please post more information like tank size, feeding amount, system equipment, amount of live rock etc...

For example: I have been fixing a phosphate problem for 6 months in my tank, a 90 gallon tank with 30 gallon sump that has 120lbs of live rock. The tank had high level of phosphates for a long time so the rock absorbed the phosphates and are releasing them now. I could have used other methods to speed up the process but I chose a long slow process since I did not want to take my rock out and "cook" them. I am using GFO & carbon dosing to lower my phosphates slowly.
 
My tank is a aquired tank from a friend and phosphates were 1.3 got them down too .06 for now but seems like a constant battle.. Sand must be terrible...
 
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